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Plumbing Repairs And Utilities

c. DANGEROUS UNDERRIM CONNECTIONS.

(I) Fixtures with under rim connections, such as water closets, pedestal and wall urinals with integral flush rims or siphon jets, and other fixtures with directly connected water supplies are potentially dangerous unless approved backflow preventers are installed above the rims between flush valves and fixtures.
(2) Coffee urns, cooking urns, steam tables, and other food- or drink-processing apparatus with direct water supply and sewer connections can be as great a health hazard as interconnections of potable and no potable water systems. Provide indirect wastes for such equipment. (See (7), fig. 14.)

d. MISCELLANEOUS EQUIPMENT. Fixtures and equipment listed below are potentially dangerous. Connect them to the water supply or drainage system carefully, taking all possible precautions to protect the potable supply.

(1) Hospital and clinical equipment, such as instrument, utensil, and bedpan sterilizers; bedpan washers; service sinks with flush rims and flush valves; clinical or dental cuspidors; continuous-flow baths with under rim supply; steam tables with under table water supply connections; and aspirators.
Note. These installations must be approved by the post surgeon.
(2) Industrial processing vats or tanks with direct water supply connections.
(3) Dishwashers and laundry equipment with direct supply and waste connections.
(4) Air conditioning equipment with dual potable- and no potable-water supply connections or with direct connections from water system to drainage system.
(5) Under rim or underwater supplies to swimming pools, aquariums, and similar ponds or tanks.
(6) Grease traps with water-cooled jackets or with direct under rim connections for flushing.
(7) Ejector type cellar drains.
(8) Floor drains with flushing rim and direct water supply connection.
(9) Filters with drain connected directly to sewer or drainage system.
(10) Fixtures with a common or integral supply inlet and water-outlet opening.
(11) Water and sewer lines laid underground in the same trench with water line lower than the sewer.
(12) Hydraulic lifts with waste connected directly to a drain or sewer.